W DOC AIRBUS | TSM A320F

Failure of the COCKPIT CALL Indicator Light

TASK 23-42-00-810-801-A
Failure of the COCKPIT CALL Indicator Light

1. Possible Causes
  • IND LT-COCKPIT CALL (14WC)
  • wiring
  • LGCIU-1 [5GA1]
  • RELAY-IND LT SUPPLY (6WC)
  • RELAY-L & R MLG FLT CTLD (16WC)
  • P/B SW-RESET (12WC)
  • P/B SW-CALLS/MECH (1WC)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-42-00-710-001
Operational Test of the Mechanic Call
ASM 234201
AMM 32-31-71-000-001
Removal of the LGCIU
AMM 32-31-71-400-001
Installation of the LGCIU
AMM 33-14-00-710-001
Operational Test of the Lights
3. Fault Confirmation
Subtask 23-42-00-710-050-A
A. Test
   (1) Do the operational test of the mechanic call AMM 23-42-00-710-001.
4. Fault Isolation
Subtask 23-42-00-810-050-A
A. If during the operational test the COCKPIT CALL indicator light does not come on:
   (1) If the fault continues:
  • replace the IND LT-COCKPIT CALL (14WC).
     (a) If the fault continues:
  • do a check and repair the wiring of indicator light (14WC) pins 1 to 4 and pin 5 to the terminal block ASM 234201.
   (2) If the indicator light comes on:
     (a) Do the test given in Para. 3. and if the fault continues:
  • replace the RELAY-IND LT SUPPLY (6WC).
     (b) If the fault continues:
  • replace the RELAY-L & R MLG FLT CTLD (16WC).
     (c) If the fault continues:
  • replace the P/B SW-RESET (12WC).
     (d) If the fault continues:
  • replace the P/B SW-CALLS/MECH (1WC).
     (e) If the fault continues:
  • do a check and repair the wiring of these components:
    . LGCIU1 (5GA1)
    . relays (6WC) and (16WC)
    . pushbutton switches (1WC) and (12WC)
    . indicator light (14WC)
    ASM 234201.
Subtask 23-42-00-710-051-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:42 UTC
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